USCG Exam PracticePassing distance and CPA from chart plot
When determining whether a risk of collision exists, which method is identified as the canonical means of detection?
- A. Monitoring the target's speed over ground using AIS data
- ✓ Observing compass bearings of an approaching vessel; if bearing remains constant and range is decreasing, risk of collision existsCorrect
- C. Plotting the target's true course and speed on an ARPA display for three minutes
- D. Applying the doubling-the-angle technique to successive relative bearings
Why B is correct
Bowditch Ch. 7 §704 states that compass bearings of an approaching vessel are the canonical method of detecting risk of collision, and that constant bearing with decreasing range (CBDR) indicates risk of collision exists. The other options describe useful techniques but are not identified as the canonical method in the supplied sources.
Cited:Bowditch Ch. 7 §704